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The code looks fine. The only problem I have with it that it
seems to assume that any POSIX system implements wait4.
However, I don't see it in Single Unix V3, so I think there
should be some configure test to determine whether the
function is present.

Also, it would be nice if the resource module was only
imported if wait4 was actually called.

I can't see documentation changes; please provide a patch
for Doc/lib/libos.tex as well.

If you resubmit the patch, it would be easiest if the patch
was a single file, eg. generated with "cvs diff -u". There
is no need to include configure changes; configure.in would
be sufficient.